Hofek



(No Model.) 2 Sheets-Sheet 1.

I C. R. VIEHOPER.

LESSON DISPLAYING DEVICE. No. 358,761. Patented Mar. 1 1887.

WITNESSES. o lA/VE/VTOH N. PETERS. Fhowmhn n ner. Waahinghn D. C.

(No Model.)

2 Sheets'Shee-t 2.

0. R. VIEHOPER. LESSON DISPLAYING DEVICE.

llllulllllllll INVENTOI? WITNESSES AUDI-P Tm N. PETERS. Pnowumn m' mr. Wa'shingmn. n.c

UNITED STATES PATENT OFFICE.

CARL ROBERT vmnornn, or INSTERBURG, PRUSSIA, GERMANY.

LESSON-DISPLAYING DEVICE.

SPECIFICATION forming part of Letters Patent No. 358,761, datedMarch l, 1887.

' Application filed Ma 6,1886. SOl'lfll No. 201,302. (ND model.)

To all whom it may concern.-

Be it known that I, CARL ROBERT VIE- HOFER, of the city of Insterbnrg, Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in Object- Teaching Apparatus, of which the followingis a specification.

Thisinvention relatesto certain new and useful improvements in apparatus to be used in object-teaching; and the object of my invention is to provide an apparatus of this kind which facilitates instructing scholars in writing, reading, 850., and improves and trains their memory.

The invention consists in the combination, with a screen having an opening which can be closed by a shutter, of a drum on which removable strips are held bearing the different names, inscriptions, pictures, &c., which drum revolves behind the screen, and is operated by the same mechanism which operates the shutter for closing the opening in the screen, all as will be fully described hereinafter, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a side View of an improved apparatus for object-teaching. Fig. l" is a front view of the same. Fig. 1 is a rear view of the screen.

' Fig. 2 is a cross-sectional elevation of the same,

parts being broken -out. Fig. 2 is a crosssectional view of one of the plates fastened on the drum for the purpose of receiving the slides. Fig. 2 is a front view of the frame and the drum. Fig. 3 is an enlarged view of the end of the drum and a cross-sectional view of the screen. Fig. 3 is a sectional plan view of the parts shown in Fig. 3. Fig. 4 is an enlarged detail sectional view of the mechanism for shifting the drum and operating the shutter. Fig. 4." is a sectional plan view of the parts shown in Fig. 4. Fig. 5 is a side view of the lever for operating the drum and shutter, parts being broken out and others in section. Fig. 5 is a plan View of the same.

Similar letters of reference indicate corresponding parts.

The frame B is fastened on an extensible standard, E, having a suitable base or leg, and in the frame B the shaft 0 is jonrnaled, 011 which is mounted the polygonal drum A. The

frame B is provided with arms 0, adjacent to the ends of the drum, on which arms a vertical screen, S, is provided, which is preferably colored green. The screen-frame is formed of a series of rods hinged together by means of hinges t and braced by means of rods L. Said screen is provided with an opening or slot, D, which can be closed by means of a shutteiyli, hinged on the outside of the screen, above the top edge of the slot D, in such a manner that it can swing up and down, the opening D being closed when the shutter is lowered. On each side of the polygonal drum A a metal or other strip, a, is held, which is provided at one end with a slot for receiving a button, a, at one end of the side of the drum, the opposite end of the strip a being held by means of a latch, a". Said strips a. may have grooved flanges along the longitudinal edges and outer surface, so as to adapt them to hold the cards or letter-plates a forming the words.

If desired, the words, pictures, &c., may be painted, printed, or otherwise produced on the strips a themselves, in which case the strips need not be flanged. The strips can be easily removed from the sides of the polygonal drum and replaced by others. On one end of the hinged shaft of the shutter 76 a grooved pulley, s, is mounted, to which one end of a chain, at, is fastened, which is also passed through an opening in the screen S, passed over a pulley, 'r, journaled at the back of the screen, and is then secured to a lever, 'i, pivoted at t to one of the arms 0 projecting from the frame B. The lever 73 is provided, at that end opposite the one at which the chain m is fastened with an eye, 1?, for receiving a pin, p projecting from the inner end of a lever, p, pivoted at p to an arm, F, projecting laterally from the arm 0. A forked lever, q, is pivoted at q to the arm F, and through the ends of the prongs of the fork and through the lever 19, which passes between said prongs, a pin, p is passed, as shown in Fig. 5. A spring, w, is fastened to the bottom edge of the lever p and rests against a screw, q, screwed on the outer end of the lever q, and provided at its upper end with a button, (f, by means of which screw the tension of the spring can be adjusted. The lever 12 is also provided at its inner end with a pimp, which projects into a slot, 9, on one end of a lever, f, pivoted at f to the inner side of the arm 0, to which lever a dog or pawl, e, is pivoted at that end opposite the one ICC provided with the slot g,which dog or pawl is provided in its swinging end with a notch for receiving pins (1, arranged in a circle on the end of the drum and around the shaft 0. A spring, 12, is fastened to the edge of the lever f and acts on the pawl or dog 6, and a stoppin, a, projects from the side of the arm 0. A sliding bolt, R, is mounted to slide between suitable guides on the inner side of the end piece of the frame B, and is provided with a downwardly-projecting lug, n, against which one end of a spring, 1), acts, fastened to the inner side of the frame 13. On its upper surface the sliding bolt is provided with an upwardly-projecting lug, it, having a rounded end, so as to adapt it to fit against the pins d of the drum. The lever 19 projects through an aperture, 0, in the arm 0.

The operation is as follows: lVhen the shutter k is closed-that is, lowered-one of the pins (1 rests in the notch in the upper end of the pawl e, and the notched end of the arm 6 of the lever f rests against one of the pins (1, as shown in Fig. 4E. The lug n on the top of the sliding bolt R also rests against one of the pins d. To open the shutter the knob or button q is raised, whereby the pin 19 on the end of the lever 12 is also raised, whereby the inner end of the lever'i is moved upward and the outer end, or end adjacent to the screen, is moved downward. The chain on is pulled down, and thereby the roller 8 is turned in the direction of the arrow, Fig. 3, whereby the shutter is swung up, the leversf and i being in the position shown in Fig. 3 and in dotted lines in Fig. 4. The letters, pictures, &c., on one of the sides of the polygonal frame can now be seen through the slot 1) of the screen S. To swing the shutter down for the purpose of closing the slot D, the knob (1 1's pressed down ward, whereby the pin p on the end of the lever is moved down, as is also the inner end of the lever 2', whereby the chain on is slackened, permitting the sh utter to swing down under the action of its own weight and to close the slot D. The pawl e is moved up ward, and as its end is engaged by one of the pins (1 the drum is revolved the distance of one pin (1. The pawl e, acting on the beveled end of the slide-bolt It, pushes the same back so as to disengage the pin cl from the lug n. The next lower pin,d, in turning strikes against the beveled end of the bolt R and pushes the same back slightly, and then the spring 1) acts on the bolt and presses the lug or against a pin, d, thus locking the drum in place. The spring 10 serves to hold the levers p q in line. Thus by a single operation the shutter it can be raised so as to expose the name, picture, &c., on one of the sides of the drum and at the same time the pawl for revolving the drum is lowered, and by another operation the shutter is released to swing down and the pawl is moved upward for the purpose of rotating the drum. The shutter in swinging up and down strikes the screen and produces a sound which calls the attention ofthe scholars to the screen.

Having thus described my invention, Iclaiin as new and desire to secure by Letters Patent- 1. In an apparatus for objectteaching, the combinatio11,with.a slotted screen, of a shutter for closing the slot in the screen, a drum mounted to revolve behind the screen, and mechanism for revolving the drum and operating the shutter on the screen, substantially as shown and described.

2. In an apparatus for object-teaching, the combination, with a slotted screen, of a shutter for closing the slot in the screen, a drum mounted to revolve behind the screen, pins projecting from one end of the drum, a pawl device for revolving the drum, a lever for op erating the shutter, and a lever for operating the pawl device and the shutter -oporating lever, substantially as shown and described;

3. In an apparatus for object-teaching, the combination, with a slotted screen, of a shutter for closing the slot in the screen, a drum mounted to revolve behind the screen, pins projecting from the end of the drum, a pivoted lever carrying a pawl for engagement with the pins of the drum, a pivoted lever connected with a chain secured to a pulley on the shaft of the shutter, and a compound lever for operating the two above-named levers, substantially as shown and described.

4. In an apparatus for object-teaching, the combination, with a slotted screen, of a shutter for closing the slot in the screen, a drum mounted to revolve back of the screen, pins projectingfrom one end of the drum, a sliding bolt for engagement with the pins, a pivotlever having a pawl which can act on the pins for the purpose of revolving the drum, and mechanism for operating the shutter with the same devices that revolve the drum, substantially as shown and described.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

CARL ROBERT VIEHOFER.

\Vitnesses:

It. Gjinnkn, U. REKAAG.

IIO 

